JohnK964

Guys check your fans my fan hub bearing went out I ordered a new hub bearing So today in prep for reinstalling everything I bead blasted the fan itself 😳

Here’s the crack so to me it’s a fan looking for a place to fly apart 😢

heliolps2

Yikes

JohnK964

Inside cracks you may need to zoom in to see them

wallra

I remember when I wanted to have my fan power coated I told the guy to look for cracks I didn't even make it out of the place and he said like this, I had to get a new fan.

Sword_of_the_Spirit

That’s a bit hard to not notice if it wasn’t covered in paint…. Great Catch!

I know it may seem a bit off-putting for some, but spray your belts with Dressing and the fine particles will find themselves clinging to the MAG and protect it. Yeah, it will look a bit 60/70’s Le Man 24hr racer, but it’s protected. I know a few that mist (very lightly and finely) a spray bottle with lightweight motor oil to have the fan induce and coat everywhere.

P.S. The alternator will be fine.

JohnK964

I had it tested and all is fine I’m replacing the voltage regulator and the capacitor while it’s out

Gregg-K

John, what capacitor are you planning to replace?
.. Gregg

JohnK964

It’s on the back side of the alternator close to the voltage regulator small black box single wire with a spade connector the plastic on mine rotted off

JohnK964

In this picture it is labeled not my picture but from another Rennlister Superdylan I believe cost like 6 dollars online. A bunch of cars that use Bosch alternators use it

Gregg-K

Ah, that's the suppressor capacitor.
.. Gregg

Sword_of_the_Spirit

Thanks for the reply. I should have worded a bit different this one point. Did you not see the crack that is external facing on the fan prior to beading?

JohnK964

no as I blasted a big pieced of paint and grime came off and there she was

JohnK964

You got me thinking so I went back and looked at every picture I could find of the fan that I have and couldn’t see anything

JohnK964

The more I think about it I’m not so sure the crack isn’t new when I first took it out I took the shroud off first and was spinning the fan and you could clearly see a wobble in it so maybe a combo thing bad bearing 30 year old fan bearing starts to go fan cracks maybe Cobalt will chime in he knows his magnesium castings

Sword_of_the_Spirit

Got it. That’s pretty interesting that the paint was laid in such a way to cover that crack without a impression of sorts showing.

Fatigue instead of the actual casting based upon what you say “wobbling.” The Mag takes a lot of heat on the cool down and thermally expands a lot.